Thank you for your testing help us find out where the problem from. Unfortunately this solution isn’t the perfect one. It will kill the GFXHDA driver as well. Hope Apple will update the driver after New Mac Pro on the table. AMD is hopeless.
Keep your AppleGFXHDA.kext in your S/L/E and Try KextsToPatch in Clover
Comment: Prevent AppleGFXHDA
Find: <4170706C 65474658 484441>
Replace: <4170706C 65474658 484442>
Very exciting to join this forum.
A friend helps me built my new iMac Pro couples weeks ago. It's always rebooted by kernel panic when I'm working or even using Chrome.
I tired to find some topics help me fix, but I could't find it.
My system as follows:
CPU: Intel 9900K